Here are the names and brief profiles of some of the herbs whose oils are considered essential oils in aromatherapy:

Angelica Root:

Angelica archangelica as botanical name, angelica root is commonly extracted through steam distillation method. It is pale yellow in color with thin consistency. It has a medium – strong strength when used initially in aromatherapy. Here is some more profile information about angelica root:
Aromatic Description: Fresh, peppery, woody, herbaceous.
Possible Uses: Dull skin, exhaustion, gout, psoriasis, toxin build-up, water retention.

Bose-de-Rose or Rosewood:

Botanically known as Aniba rosaeodora, this herb is steam distilled to get the oil. The color of the oil is clear with a yellow tinge. Other profile information includes:
Consistency: Thin
Perfumery Note: Middle
Strength of Initial Aroma: Medium
Aromatic Description: Sweet, woody, fruity, floral aroma.
Possible Uses: Acne, colds, dry skin, dull skin, fever, flu, frigidity, headache, oily skin, scars, sensitive skin, stress, stretch marks.

Parsley:

Petroselinum sativum as botanical name, parsley is also steam distilled to get the oil. Its oil color is light yellow with thin consistency. Other profile information is:
Strength of Initial Aroma: Medium - Strong
Aromatic Description: Herbacous, somewhat woody aroma.
Possible Uses: Amenorrhea, arthritis, cellulites, cystitis, frigidity, griping pains, indigestion, rheumatism, toxic build-up.

Ylang Ylang:

This herb is referred to as Cananga odorata in botany. It is steam distilled to get the oil. Here is a list of the problems for which the oil of Ylang Ylang is commonly used:

• Anxiety
• Depression
• Frigidity
• Hypertension
• Palpitations
• Stress